Electromagnetic device.



J. B. R. PALMER & F. i. HOLMES.

ELECTROMAGNETIC DEVICE.

APPLICATION FILED JUNE 8.1915.

1,230,429; Patented June 19, 1917.

WIT/7 655 36.

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//1 venfo rs: "Joe/CR. Palmer Frank .7. Holmes.

UNITED STATES-PATENT OFF 10E.

oin. c. B. PALMER, or new ROCHELLE, AND FRANK J. nouns, or NEW YORK, 11. Y., assrenons, BY nnsnn ASSIGNMENTS, ro wnsrnrm ELECTRIC comm, moon,

PORATED, A CORPORATION OF NEW YORK.

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Specification of Letters Patent. Patented June 19, 1917, 7

Application filed J une 8, 1915. Serial No. 82,845.

tively, have invented certain newand useful Improvements in Electromagnetic Devices, of which the following is a full, clear, concise, and exact description.

This invention relates to electromagnetic 4 devices, and more particularly to a polarized magnetic structure suitable for polarizin relays, telephone receivers and the like, and its object is to increase the sensitiveness of. such a device. 1

This invention provides a magnet which may be either a permanent magnet or an electromagnet, each pole of which is provided with two polar extensions forming in effect two sets of north and south poles. An armature is mounted intermediate said poles so as to be capable of movement toward. one set of north and south poles or toward the other set of north and south poles, depending upon which set of'poles is momentarily the stronger.'- I he poles of the magnet are equipped with inductive windings through which currents of reversing polarity may be sent, whereby a preponderance of flux is shifted to one set of north and south poles or the other set, depending upon the momentary polarity of said current. The invention further provides a path of low reluctance between the two polar extensions of like polarity for aiding a quick transfer of flux from one set of polar extensions to the otherv For a more complete understanding of the invention, reference may be had to the accompanying drawing in which Figure 1 represents in perspective view a polarized telegraph relay employing the principle of this invention, and Fig. 2 illustrates in skeleton form the magnetic structure employed.

In the drawing, 3 is a magnetic core equipped with a magnetizing w nding. 4.

f U-shaped magnetic polar extensions 5 and 6 suitable manner to the oppositapoles of core Thetwo poles 7 and 8 of polar extension are riveted, welded or attached in any, other 5 are .equippedQiwith the electromagnetic spools 9 and 'lO, respectively. Similarly,

poles 11 and 12 of polar extension 6 are equipped with spools 13 and 14 respectively. Supported by poles 7, 8, 11 and 12 is a frame-work 15 of brass or other nommagnetic material. An auxiliary frame-work 16 is pivotally supported at 17 and 18 by frame-work 15. The upper part of frame 16 carries the two adjustable contact points 19 and 20 which are insulated from said frame-work. The whole framework-16 is capable of lateral displacement or adjustment by means of screw 21, withoutchanging the relative adjustment of the points 19 g and 20. An armature'22 is also pivotally supported at 17 andl8 and adapted to move toward poles 7 and 11 and away from poles 8 and 12, or vice versa. Attached to armature 22 is a light contact arm 23, the upper end of which plays between the contact points l9 and 20. Iron screws 24:, 25,26

and 27 are provided to decrease the reluctance of the magnetic paths between the armalture 22 and the poles 7, 8, 11 and 12 respectively, and, serve as adjustable pole .pieces therefor. 1

In operation, the core 3 is magnetized by direct current supplied from a source 28 through the windings of coil 4 or, if desired, a permanent magnet may be substituted for the core 3. It will thus be seen that the poles 7 and 8 will be of like polarity and equal strength, and that poles 11 and 12 will be of a'polarity opposite to that of? and 8. i

If the flow of current through windinge be in the direction indicated by the arrows, poles 7 and'8 will be of north polarity and poles 11 and'12 of south polarity, and the lines of magnetic force passing through the armature 22 will thus tend to divide equally between the two poles '7 and 8 at one end and the poles .11 and 12 at the other, there being no magnetic unbalance present. If

now, the windings 9, 10, 13 and i l be con nected as shownin Fig. 2, anda current sent therethrough. in the direction indicated by the arrows, the poles 7 and 11 will be ice strengthened and the poles 8 and 12 will be a weakened with the result that a preponderance of fluxwi'll be shifted to poles V7 and 11 and the armature 22 will be drawn towardv 1 said poles. If the direction of current in the'operating windings. 9, 10, 13 andlt be reversed, the. armature will similarly .be

drawn toward poles and 12, and if said, v

current-be an alternating one, the armature will vibrate from one set of north 'and south poles to the other, in accordance with the current alternations.- Due to the fact that the magnetic path between poles 7 and 8 and also between poles 11 and 12 IlSzSllOIt and of a I low reluctance, the shifting of flux above mentioned will respond to current reversals of extreme rapidityin the operating windrequiring a qmck directional response to succeeding pulses of difierent polarities.

ings and a polarized structure is therefore provided which is well adapted to use ma high speed telegraph relay or to other uses What is claimedlis: v 1. An electromagnetic devlce comprising a magnet having two north and two south polar extensions forming two sets ofnorth and south poles, and .an' armature having one end extending between said north polar extensions and the other ende'xtending between said south polar extensions and adapt- 7' 7 ed tomove toward one set of north and south poles or toward: the other set of north or south poles.

2. An" lectromagneticdevlce comprising a' magnet having two north and two south polar extensions forming two sets of north fandsouth poles, an armature having one end extendin between said north polar exten-' sionsran the other end extending between said south polarextensions and adapted to move towardoneset of north and south poles. or toward the other set ofnorth and south poles, and a path of low magnetic refluctance between said polar extensions of like. polarity. r

3. electromagnetic devicecomprisingi a magnet having "two north and two south polar extensions formingtwo sets of north and south poles, an armature mounted 1ntermediate said two sets of p les, and wind- .ings on said polar-extensions for shifting a on. said poles for simultaneously strengthen- 3 111g one of said sets. of north and south poles and weakening the other set of north and south poles. i

5. An electromagnetic device comprising a magnet, a U-shaped polar extenslon on each pole of said magnet, a winding on each limb of each of said polar BXtBIISIOIIS, and

of like polarity and pivotally mounted to move between said limbs in a direction transverse to the field of said magnet.

6. An electromagnetic device comprising a magnet, a U-shaped polar extension on each polethereof, forming two sets otnorth and south poles, a winding on each limb of each of said polar extensions whereby a preponderance of flux may be shifted to one or the other set of north and south poles, and

an armature pivotally mounted to follow said shifting of flux.

In witness whereof, we hereunto subscribe JOEL c. n. PALMER. .FRANK J. HOLMES.

. an armature extending between said limbs our names this 4th day of June, A; D4915.- 

